Tool-holder



J. H. MASON.

TOOL HOLDER.

APPLICATION FILED JULY 17 Patented Mar. 23, 1920.

JOSEPH n. MASON, ornasct raovinnnon, nnonn ISLAND.

root-nonnnn.

rename.

Specification of Letters Patent.

Patented Mar. 23, 1920.

Application filed July 17, 1919. Serial No. 311/193.

all whom it may concern: 1

Be it known that l, Josnrn "fl. WIASON, a citizen of the United States, and resident of East Providence, in the county of Providence and State of lthode Island, have in vented certain new and useful Improve ments in Tool-Holders, of which the following is a specification.

This invention relates to an improvement in tool holders, and has for its object to provide such a holder which is more particularly adapted to be employed for turning cylindrical work to a definite size, the mechanism being so arranged that a micrometer reading of the tool adj ustment relative to the work, may be obtained; the device being adapted for use in connection with turning machines such as lathes, screw machines and the like in which close or accurate work is required.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1- is a side elevation of the device partly in section illustrating the operating mechanism.

Fig. 2 is an end view of the device with .the operating handle and bearing nut re moved.

Fig. 3- is a top view of the operating handle, showing the micrometer graduations marked on the outer surface thereof, the han- Clle being shown as mounted in its bearing nut.

Fig. is a perspective view of the tool and its follower, and the adjusting screw connected to the follower.

Referring to the drawings, designates the framework of the holder through the body portion of which is formed a transverse opening 11 in which the cutting tool 12 is slidably mounted to be moved in and out relative to the work.

The tool is preferably formed so as to h ave a sliding fit in this opening 11 the inner end 18 of this tool being beveled off to form a cutting edge and the opposite end of the tool is shown as being provided with a dovetailed slot 1% to receive the correspondinglyshaped end of the follower 15. This follower also has a sliding lit in this hole 11, and to its outer end is connected a screwthreaded rod 16 which normally extends some distance beyond the end of the frame and is connected tothe follower by a pin 17 or other suitable means.

A tubular operating handle member 18 is provided for housing this screw 16 and a nut 19 is also fixed in the handle to engage the screw. The inner end 20 of this handle rests a ainst the face of a counter-bore in the frame and a bearing nut 21 is threaded at 22 into a larger counterhore in the frame, which nut is provided with an outwardly extending thin-edged lip 23 which is lined at 2% to cooperate with the graduations 25 on the outer surface of the operating handle so that an accuratereading maybe obtained.

Set screws 26 are provided for engaging both the edge and side of the tool to securely bind it in adjusted position.

A back rest supporting arm 27 may also be formed on this frame if desired, in which arm I mount an adjustable back rest 28 which is retained in adjusted position by means of set screws 29.

In operating my invention it is only necessary to provide one end of the cutting tool with a dovetailed slot to [it the correspond ingly-shaped key portion 14 on the end of the follower.

When the tool is positioned to engage the work the cutter is set to take the first cut by rotating the operating handle. After these first or roughening cuts have been made the work is calipered to determine the remaining number of thousandths to be taken off to finish and with my improved device it remains only necessary to rotate the operating handle 18 so that the micro1neter reading will indicate the desired number of thousandths, and the next cut will accurately finish the job.

By this construction the tool may be adjusted and movcdin or out as desired relative to the work. When applied to a machine requiring fine work much time is saved in setting the cutter and great accuracy is obtained.

The back rest 28 of course supports the work and prevents the same from springing away from the cutting tool. My improved micrometer feed for turning tools is extremely simple and practical in construction and efiective in its operation and it is not limited to the particular shape illustrated but may be adapted to be mounted on the carriage of any turning machine such as a lathe, screw machine and the like and eniployed as an auxiliary holder.

The foregoing description is directed solely toward the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to wltich the device is susceptible the invention eing defined and limited only by the terms of the appended claims.

I claim:

1. A tool holder comprising a body portion in which a tool is slidably mounted, a screw for adjusting the tool endwise, a hollow operating handle graduated on its outer surface and housing said screw, a detachable bearing member by which said handle is operatively connected to said body, and a nut in said handle engaging said screw whereby by a rotation of said handle a micrometer adjustment of the tool relative to the work is obtained.

2. A. tool holder comprising a body portion in which a tool is slidably mounted, a follower connected to the tool, an adjusting screw connected to said follower, a tubular operating handle graduated on its outer surface and inclosing said screw, a nut in said handle engaging said screw, a bearing in which said handle is rotatably mounted whereby the rotation of said handle either advances or withdraws said tool relative to the work.

3. A tool holder comprising a body portion in which a cutting tool is slidably mounted, an adjusting screw connected to move the tool either toward or from the work, an operating nut on said screw, a tubular operating handle housing said nut and screw and graduated on its outer surface, and a bearing nut operatively supporting said handle on said body whereby the rotation of said handle will adjust the tool relative to the work and the amount of adjustment be accurately indicated.

In testimony whereof I afiix my signature in presence of two witnesses.

JOSEPH H. MASON.

Witnesses:

WALTER H. NAYLOR, WILLIAM E. TURNER. 

